/* eslint-disable camelcase */
/* eslint-disable eqeqeq */
/* eslint-disable */
import { saveAs } from 'file-saver'
import XLSX from 'xlsx-style'

function generateArray(table) {
  var out = []
  var rows = table.querySelectorAll('tr')
  var ranges = []
  for (var R = 0; R < rows.length; ++R) {
    var outRow = []
    var row = rows[R]
    var columns = row.querySelectorAll('td')
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C]
      var colspan = cell.getAttribute('colspan')
      var rowspan = cell.getAttribute('rowspan')
      var cellValue = cell.innerText
      if (cellValue !== '' && cellValue == +cellValue) cellValue = +cellValue

      // Skip ranges
      ranges.forEach(function (range) {
        if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null)
        }
      })

      // Handle Row Span
      if (rowspan || colspan) {
        rowspan = rowspan || 1
        colspan = colspan || 1
        ranges.push({
          s: {
            r: R,
            c: outRow.length
          },
          e: {
            r: R + rowspan - 1,
            c: outRow.length + colspan - 1
          }
        })
      };

      // Handle Value
      outRow.push(cellValue !== '' ? cellValue : null)

      // Handle Colspan
      if (colspan) { for (var k = 0; k < colspan - 1; ++k) outRow.push(null) }
    }
    out.push(outRow)
  }
  return [out, ranges]
};

function datenum(v, date1904) {
  if (date1904) v += 1462
  var epoch = Date.parse(v)
  return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000)
}

function sheet_from_array_of_arrays(data, opts) {
  var ws = {}
  var range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  }
  for (var R = 0; R != data.length; ++R) {
    for (var C = 0; C != data[R].length; ++C) {
      if (range.s.r > R) range.s.r = R
      if (range.s.c > C) range.s.c = C
      if (range.e.r < R) range.e.r = R
      if (range.e.c < C) range.e.c = C
      var cell = {
        v: data[R][C]
      }
      if (cell.v == null) continue
      var cell_ref = XLSX.utils.encode_cell({
        c: C,
        r: R
      })

      if (typeof cell.v === 'number') cell.t = 'n'
      else if (typeof cell.v === 'boolean') cell.t = 'b'
      else if (cell.v instanceof Date) {
        cell.t = 'n'
        cell.z = XLSX.SSF._table[14]
        cell.v = datenum(cell.v)
      } else cell.t = 's'

      ws[cell_ref] = cell
    }
  }
  if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range)
  return ws
}

function Workbook() {
  if (!(this instanceof Workbook)) return new Workbook()
  this.SheetNames = []
  this.Sheets = {}
}

function s2ab(s) {
  var buf = new ArrayBuffer(s.length)
  var view = new Uint8Array(buf)
  for (var i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF
  return buf
}

export function export_table_to_excel(id) {
  var theTable = document.getElementById(id)
  var oo = generateArray(theTable)
  var ranges = oo[1]

  /* original data */
  var data = oo[0]
  var ws_name = 'SheetJS'

  var wb = new Workbook()
  var ws = sheet_from_array_of_arrays(data)

  /* add ranges to worksheet */
  // ws['!cols'] = ['apple', 'banan'];
  ws['!merges'] = ranges

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name)
  wb.Sheets[ws_name] = ws

  var wbout = XLSX.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary'
  })

  saveAs(new Blob([s2ab(wbout)], {
    type: 'application/octet-stream'
  }), 'test.xlsx')
}

export function export_json_to_excel({
  SheetNames = 'sheet', // 新增的参数，sheet名称
  multiHeader = [],
  header,
  data,
  filename,
  autoWidth = true,
  bookType = 'xlsx',
  colorCol = [], // sheet2中需要变色的列的名称（如： '属性'）
  colorColData = []
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  var wb = new Workbook()

  let colorIndex = -1;
  let colIndex = 0
  header.forEach((col, i) => {
    if(col == colorCol[colIndex]){
      if(colorIndex==-1){
        colorIndex=i
      }
      else{
        colorIndex = colorIndex+'_'+i
      }
      colIndex = colIndex + 1
    }
  })
  const merges = []
  for(let i = 1; i < data.length; i = i + 2){
    const str = 'A' + (i + 1) + ':A' + (i + 2)
    merges.push(str)
  }
  const sheet = oneSheet(data, header, merges, autoWidth)
  wb.SheetNames.push(SheetNames)
  wb.Sheets[SheetNames] = sheet
  const colorIndexList=(''+colorIndex).split('_')
  for(let i=0;i<colorIndexList.length;i++){
    setExcelStyle(SheetNames, colorIndexList[i], colorColData[i], sheet, data.length)
  }

  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  })
  saveAs(new Blob([s2ab(wbout)], {
    type: 'application/octet-stream'
  }), `${filename}.${bookType}`)
}

// 渲染一个sheet
function oneSheet(data, header, merges, autoWidth) {
  // 表头
  data.unshift(header);
  // 调用上面的合并单元格函数
  var ws = sheet_from_array_of_arrays(data)
  if (merges.length > 0) {
    if (!ws['!merges']) ws['!merges'] = []
    merges.forEach(item => {
      ws['!merges'].push(XLSX.utils.decode_range(item))
    })
  }
  if (autoWidth) {
    /* 设置worksheet每列的最大宽度 */
    const colWidth = data.map(row => row.map(val => {
      /* 先判断是否为null/undefined */
      if (val == null) {
        return {
          wch: 10
        }
      }
      /* 再判断是否为中文 */
      else if (val.toString().charCodeAt(0) > 255) {
        return {
          wch: val.toString().length * 2
        }
      } else {
        return {
          wch: val.toString().length
        }
      }
    }))
    /* 以主表第三行为初始值，因为我的第一行是表格标题，第二行是副标题时间，所以以主表第三行表头为初始值 */
    const result = colWidth[0]
    for (let i = 1; i < colWidth.length; i++) { // 从第二行（i=1）开始到倒数第二行（i<colWidth.length）进行比较，调整列宽
      for (let j = 0; j < colWidth[i].length; j++) {
        if (result[j].wch < colWidth[i][j].wch) {
          result[j].wch = colWidth[i][j].wch
        }
      }
    }
    ws['!cols'] = result
  }
  return ws
}

// 设置表格样式
function setExcelStyle(sheetName, colorIndex, colorColData, dataInfo, length) {
  let i
// 设置表格样式，数字不够可以再往后面加AA，AB……
  const arrabc = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
  let C = ''
  if (parseInt(colorIndex) > 25){
    C = arrabc[Math.floor(parseInt(colorIndex) / 26)] + arrabc[(colorIndex % 26)]
  } else {
    C = arrabc[colorIndex]
  }

  for (let i in dataInfo) {
    if(i.replace(/[^a-zA-Z]/g, '') === C){
      var num = parseInt(i.replace(/[^0-9]/ig, ''))
      let rgb = '' // 填充颜色,注意颜色不带井号
      if(num > 1){
        switch (colorColData[num - 2]) {
          case '绿色':
            // 表格内容值置空
            rgb = '00FF7F'
            dataInfo[i].s = {
              alignment: {
                horizontal: 'center',
                vertical: 'center'
              },
              fill: {
                fgColor: {
                  rgb
                }
              }
            }
            break;
          case '黄色':
            rgb = 'ffeb9c'
            dataInfo[i].s = {
              alignment: {
                horizontal: 'center',
                vertical: 'center'
              },
              fill: {
                fgColor: {
                  rgb
                }
              }
            }
            break;
          case '红色':
            rgb = 'f56c6c'
            dataInfo[i].s = {
              alignment: {
                horizontal: 'center',
                vertical: 'center'
              },
              fill: {
                fgColor: {
                  rgb
                }
              }
            }
            break;
          case '蓝色':
            // 表格内容值置空
            rgb = '4169e1'
            dataInfo[i].s = {
              alignment: {
                horizontal: 'center',
                vertical: 'center'
              },
              fill: {
                fgColor: {
                  rgb
                }
              }
            }
            break;
          default:
            dataInfo[i].s = {
              alignment: {
                horizontal: 'center',
                vertical: 'center'
              },
            }
            break;
        }
      }
    }
  }
  // 暂去1⭐设置单元格框线
  // const borderAll = {
  //   top: {
  //     style: 'thin'
  //   },
  //   bottom: {
  //     style: 'thin'
  //   },
  //   left: {
  //     style: 'thin'
  //   },
  //   right: {
  //     style: 'thin'
  //   }
  // }

  // 暂去2⭐给所有单元格加上边框，内容居中，字体，字号，标题表头特殊格式部分后面替换
  // for (var i in dataInfo) {
  //   if (i == '!ref' || i == '!merges' || i == '!cols' || i == '!rows' || i == 'A1' || i == 'A2' || i == 'A' + String(length + 1) || i == 'A' + String(length + 2)) { // 第一行A1，第二行A2以及倒数第二行，倒数第一行不加border
  //     // 不做处理
  //   } else {
  //     dataInfo[i + ''].s = {
  //       border: borderAll,
  //       alignment: {
  //         horizontal: 'center',
  //         vertical: 'center'
  //       },
  //       font: {
  //         name: '微软雅黑',
  //         sz: 10
  //       }
  //     }
  //   }
  // }

  // 测试部分
  // dataInfo['B2'].s = {
  //   fill: {
  //     fgColor: {
  //       rgb: '66b1ff'
  //     }
  //   },
  //   alignment: {
  //     vertical: 'center',
  //     horizontal: 'center',
  //   }
  // }

  // ⭐ 以下代码为样式设置：给标题、表格描述信息、表头等部分加上特殊格式
  // arrabc.some(function (v) {
  //   for (let j = 1; j < 4; j++) {
  //     const _v = v + j
  //     if (dataInfo[_v]) {
  //       dataInfo[_v].s = {}
  //       // 标题部分A1-Z1
  //       if (j == 1) { // A1第一行居中加粗
  //         dataInfo[v + j].s = {
  //           font: {
  //             name: '微软雅黑',
  //             sz: 11,
  //             color: {
  //               rgb: '000000'
  //             },
  //             bold: true,
  //             italic: false,
  //             underline: false
  //           },
  //           alignment: {
  //             horizontal: 'center',
  //             vertical: 'center'
  //           }
  //         }
  //       } else if (j == 2) { // A1第一行居左
  //         dataInfo[v + j].s = {
  //           font: {
  //             name: '微软雅黑',
  //             sz: 10,
  //             bold: false,
  //             italic: false,
  //             underline: false
  //           },
  //           alignment: {
  //             horizontal: 'left',
  //             vertical: 'center'
  //           }
  //         }
  //       } else { // 表头  加背景加粗
  //         const fv = v + 3
  //         dataInfo[fv].s = {
  //           border: borderAll,
  //           font: {
  //             name: '微软雅黑',
  //             sz: 10,
  //             bold: true
  //           },
  //           alignment: {
  //             horizontal: 'center',
  //             vertical: 'center'
  //           },
  //           fill: {
  //             fgColor: {
  //               rgb: 'f0f0f0'
  //             }
  //           }
  //         }
  //       }
  //     }
  //   }
  // })
}
